Bending-machine.



BENDING MACHINE.y APPLICATION mzokxuns 24. 1912.

Patented Oct. 31, 1916.

2 SHEETS-SHEET l.

me Nanms rrrtzs oo.. ruumumo.. wAsNmomN, n. c.

H. A. STREETER & R. C. CARNAHAN.

BENDING MACHINE.

APPLICATION FILED 11111524, 1912.

Patented '001. 31,1916.

2 SHEETS-SHEET 2- FL? Z 1415.5

me Nomar: Pzrms cm1-nam uma. wAsNlm: ran. n. c.

. ticley after being UNITED sTATEs PATENT oEEioE. V`

HERBERTA. STREETER ANI) ROBERTIC. CARNAHAN, .OFTCHICAGQILLINOIS ASSIGN- ORS, `BY DIRECT- .AND MESN-E ASSIGNMENTS, TO-.S-'IREETER CLIP @t 'SPECIALTY CO., OF CHICAGO, ILLINOIS, .A yCORPORAIION OF ILLINOIS.

BENDINGJVIA'CHINE.

Specification of Lett'ers Patent. Patented 001;, 31, 1916.

Application le'd J' une 24, 1912. Serial-No. 705,391.

To @ZZ whom t may concern Be it known that we, HER-BERT A. STREETER indicated, of largeI capacity, and radaptedl to Y operate on two sizes of clips atthe' same time rwithout the-necessity forl adjusting any ofthe parts. i

Another object of thevinventonis to pro-^ vide a bender having an anti-friction roller on'its activev edge, whichwill be in direct contactlwiththe article being bent vduringy the bending operation, thus eliminating a great amount of friction, and consequent waste of power, as compared with former types of bending machines.

A third object of the invention is to provide driving mechanism for operating bot-h benders: of the machine, vso as to give an oscillating motion theretol fromV a power shaft-continuously drivenv in one direction`v only.

' In the drawing forming apart of this specification, Figure 1 is 'a frontview of ar machine Yembodying our improvements.V Fig. 2 is an' end elevation lof the' machine', as viewedy from thefrlght of the structure shown vin Fig. 1. Figs. 3 and l are vertical, sectional views, taken ron' the-linesw-B and 4-4c, respectively, -of Fig. 1. Fig. 5 is a vertical, sectional view, taken on` the linea-5 of Fig. 6. Fig. 6 is a vertical, sectional view, taken on the line 6--6` of Fig. 5, and Fig. 7 is a detail, perspective view of thel nished are operated upon in this machine.

In the drawing, A 'den'otes'a framework members A1 and A2, to which are 1' ourna'led the various shafts hereinafter described'.

Ina'smnch as the bending mechanisms on each end of the machine are substantially identical, the description will be limited to parts ofV one of them, except in so far as it'is n'ecessaryto` describe 'the 4common driving mechanisms.

Each bending mechanism comprises a station'arv forming mandrel 10 secured to a bracket 11, which, in turn', is removably secured to one of the upright members A1 or A2 of the frame. Adjustably mounted -on each bracket 11 is a plate 12, provided with a retaining member 13 arranged parallel to the forming mandrel 10 and spaced therefrom, and between which is 4adapted to be placed the clip. B, which', when introduced into the bending machine, has its wings B1 and B2 bent-at right anglesfto the vertical portion B3, the portion B4 being bent or curved by the bender, as hereinafter described. Secured to the member 13 is a rod 14, on which isafdjustably mounted a `sleeve 15, to which is secured in turna supporting table 16 upon which the clips B are' adapted to rest and be Vsupported lduring the bending. operation.

( loperatin'g with each of the forming manclrel's 10 1s a pivoted vben-der, the latter comprising `a. 'head plate 17 keyed to ashaft 18,

it being understood. that the shaft 18 is c0m' m-o-nto the head plates at both en'd's of the machine, said head plate havinfg a bender 11S -adjustably secured thereto as by means of bolt and slot connections, which bender is in the lform of a bracket having a latemily-extending arm 19, and freely and ref tatably mounted'in the arm 19 is' an antifriction roller 20, the latter, as more clearly shown inl Figs; 5 andt, forming the active edge of the bender and adapted to "bend the Y portion B4 of the clip around Ethe Vmand-rel j1-'0 tothe position'rshown'i'n' dotted line in Fig.'5. Bower is derived from anyv suitable source, not shown, and is transmitted to the machine as by means of a belt 21 Yto drive continuously the pulley 22 looselyV mounted on the power shaft'23, `saidpulley being provided with a clutch face member 24, with which is adapted to coperate a clutch member 25, keyed tothe shaft 23 and ad'aptedfto be moved into engagement with the Vclutch member '241,- ajs by means of a piv'oted lever 26 operatedv from-1a foot treafdleV 27, and normall-ly held disengaged by means of a Vretracting spring 28 secured to the `lever and to a stationary part ofthe fram e. Also keyed to the shaft 23 is a small pinion 29,

meshing` with a larger pinion 30, secured to the shaft 31, said shaft 31 being provided with two partial or segmental gears 32 and 33 set approximately at 100 degrees to each other, the segmental gear 32 being adapted to drive intermittently through the intermediary of a pinion 311, the gear 35 keyed to the shaft 18 so as to give the latter a partial revolution clockwise to rotate the bender in a forward direction at the right hand end of the machine, as viewed in Fig. 1. The segmental gear 33 is also adapted to rotate the shaft 13 a partial 'revolution intermittently by engaging the gear 36, also keyed to the shaft 18, but, as will be obvious, the direction of rotation given to the shaft 18 by the segmental gear 33 will be opposite to the direction of rotation given to it by the segmental gear 32, and these movements will be given alternately and intermittently, it being further understood that the segmental gears 32 and 33 are not only set 100degrees apart, but each comprises less than a half gear in order to allow sufiicient clearance between the disengagement of one segmental gear and the engagement of the other. ln order to insure the stopping of the pivoted benders at the proper position at the end of their return movement, one of the head plates 17 is provided with a notch 17a in which is adapted to engage a projection on the end of a spring controlled, pivoted lever 37, and adapted to be moved from enga-gement with the head plate 17 by means of a cam 38 secured to the shaft 31. In order to prevent overthrow of the benders, an adjustable friction brake 39 (see Fig. l) is provided on the shaft 18, the friction brake being in the form of a split sleeve secured to the upright member A2 of the frame.

From the foregoing description, it will be apparent that the machine may be set up` with. forming mandrels of different sizes at each end of the machine, and the retaining and supporting means for the clips adjusted for various sizes, and that the machine may operate simultaneously to bend clips of different sizes, where it is desired to employ .an operator at each end of the machine, thus providing a machine of exceedingly high capacity as compared with the old type of hand operated bending machines for performing the same operations, and it will also be noted that the oscillating movement to each of the benders vis derived from a power shaft adapted to be rotated in one direction only, thus obviating the necessity for reversing clutches or other complicated similar devices. It will also be noted from an inspection of the drawing and reading of the description, that the segmental gear 33 operates to move the benders in a forward direction, that is to bend the metal, at

a much slower rate than does the segmental gear 32 to return the bender to its starting position, and with this arrangement suficient time is left at the end of the return movement of the bender for the operator or f which hitherto has been a defect in bending machines, particularly those operating on light metal such as this machine is more particularly designed for.

lle have shown one form of our improvements, but the same is merely illustrative, and it will be understood that various changes and modifications may be made in the details of the construction without departing from the spirit of the invention, and all changes and modifications are contemplated as fall within the scope of the claims appended hereto.

lVe claim l. A clip bending machine including, in combination: a stationary mandrel; an 0scillatable bender coperating with said mandrel; and automatically operable powerdriven means for moving said bender on,

its forward active stroke at a slower rate than on its return inactive stroke, substan-` tially as specified.

2. A bending machine including, in combination: a stationary mandrel and ya bender oscillatable about ysaid mandrel and coper-v 3. A clip bending machine including, in

combination: Va stationary mandrel; and means coperating with said mandrel to bend a clip therearound, said means including an oscillatable head plate, a bracket adjustably mounted thereon and an antifriction roller mounted in said bracket, the antifriction roller forming the active edge of the bending means, substantially as specilied.

e. A clip bending machine including, in combination: a stationary mandrel; an oscillatable bender cooperating with said mandrel; and means for supporting and retaining a clip in position while being operated upon, said means including members adjustable verticallyV and horizontally relatively to said mandrel to thereby adapt the machine for operating onclips of different sizes and types, substantially as specified.

5. A clip bending machine including, in

combination: a stationary mandrel; anoscillatable bender cooperating with saidA mechanism for oscillatingsaid bender and means adjustable relatively to the mandrel for retaining the article being operated upon in position, said bender and former being adjustable relatively to each other.

S. A clip bending` machine including in combination, a mandrel and means coperating With said mandrel to bend a clip thereabout, with said means including a member oscillatable about an axis parallel With the bend to be made in said clip and located at a side of said clip, a bending element carried by said member, and means for automatically oscillating said member and bender at predetermined intervals, substantially as specified. Y

9. A clip bending machine including in combination, a stationary mandrel and means cooperating with said mandrel to bend a clip thereabout, said means including an oscillatable head plate, a bracket adjustably mounted thereon and a bending member extending out from said head plate, substantially as specified.

10. In a clip bending machine, the combination of a shaft carrying a pair of offset bending elements, a mandrel for each element, a driving shaft, an intermittently operable gear connection between said driving shaft. and said bending element carrying shaft for imparting a partial Working revolution to said benders about said mandrel,V

and a second intermittently operable gear connection between said shafts for rotating said bending element carrying shaft through a partial idle revolution in opposite direction to its Working stroke, substantially as speciiied.

11. In a clip bending machine, the combination of a shaft carrying a pair of offset bending elements, a mandrel for each element, a driving shaft, an intermittently 0perable gear connection between said driving shaft and said bending element carrying shaft for imparting a partial Working revolution to said benders about said mandrel, and a second intermittently operable gear connection between said shafts for rotating said bending element carrying shaft through a partial idle revolution in opposite direction to its Working stroke and at a greater speed, substantially as specified.

HERBERT A. STREETER. ROBERT C. CARNAHAN.

Vitnesses PEARL ABRAMs, I-I. M. MUNDY.

Copies of this patent may be obtained for ve cents each, by addressing the Gommissioner of Patents, Washington, D. C. 

